Bush trimmer



May 26, 1925.

2 Sheets-Sheet 1' K. DOMBECK BUSH TRMMER Filed Dec'. 20. 1925 May 26,` 1925. 1,539,650

K. DOMBECK V BUSH TRIMMER Filed Deo. 20, 1925 2 Sheets-Sheet 2 Patented May 26, 1925.

UNITED STATES KAZIMER DOMBECK, OF AMSTERDAM, NEW YORK.

BUSH TRIMMER.

Application led December 20, 1923.

T0 all whom t 'may concern:

Be it known that I, KAZIMER Doiuiion, a citizen of the United States of America," residing at Amsterdam, in the county of Montgomery and State of New York, have invented certain new and useful Improvements in Bush Trimmers, of which the following is a specification.

This invention relates to new and useful improvements in bush Y trimmers of the wheeled type. v

An important object of the linvention is to provide a trimmer that is especially adapted for heavy work, such as cutting bushes having relatively stout or thick branches corn stalks, etc.

A further object of the invention.v is to provide an implement of the above inentioned type which may be readily manipulated by hand and comprises certain features of construction and combinations of parts which produce a very efficient device and one that may be manufactured at a very nominal cost.

Other objects and advantages of the invention will be apparent during the course of the following description. f

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevational view of the implement embodying this invention with the mold board, associated therewith, shown in longitudinal section, Y y

Figure 2 is a top plan view of the implenient shown in Fig. 1 with the mold board removed,

Figure 3 is a transverse sectional view taken upon line III-III of Fig. 2, l

Figure 4t is a transverse sectional view taken upon line IV-IV of Fig. 1,

Figure 5 is a detail perspective view of porting the mold board,

Figure 6 is a detail perspective view of one of the blade operating bars embodied in this invention, and

Figure 7 is a detail perspective view of one of the blades.

Figures 8 and 9 show the construction of the mold board removed from vthe implenient. i

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of this invention, the numeral 5 desig- Seral No.l 681,768.

nates the transversely extending rear frame bar having the depending end. portions 6 which are provided with the stub axles 7 at their lower ends which extend laterally outwardly and are in axial alinement. These stub axles 7 are adaptedfor rotatably supporting the ground engaging wheelsy 8 which are retained in spaced relationto the depending end portions 6 ofthe yrear frame bar 5 by means ofthe spacer rings 9.v ,This transversely extending rear yframe bar 5 is further provided with a bearing portion 5a which is adapted for rotatably supporting an operating shaft v10 which will be described in detail at a later point.` Properly secured to the transversely extending rear frame bar 5, as at 11, are the forwardly extending framebars 12 which are arranged in pairs and positioned adjacent each end of the said bar 5 and are connected thereto at opposite side faces thereof. These forwardly extending frame` bars 12 are provided for substantially the forward half of their lengths with `oppositely offset end portions 13, as best illustrated in Fig. 1. The forwardly extending frame bars 12, injuxtaposition to the starting points of the oppositely offset end portions 13, are provided with a front transversely extending frame bar 14 bar 14 is provided with .a bearing portion V14a which is in axial alinement with' the bearing portion 5a of the rear transversely extending frame bar 5 and is provided for bars 12, as at 15, are the auxiliary forwardly extending frame arms 16 which are of arcuate formation in plan view and terminate vat their outer ends intransverse alinement with the outer ends of the oppositely'offset the bridge piece which is employed for supend portions 13. These loppositely offset V'which is interposed between the opposite t pairs of bars 12 and secured thereto, as at '15. This front transversely extending frame end portions 13 and auxiliary frame arms 16 are adapted for supporting the parallel rigid blade supporting bars 17, as best illustiated 'in Figs. 1 and 2. 1 f

In Fig. 7 there is shown in detailv one of the cutting blades which consists of a blade portion 18 having the oppositek arcuate cutting edges 19 andthe shaiikportion 20hav-4 ing the offset end portion 20a. Theshank portion 2O is provided with an aperture-21 while the extreme outerfend of the offset shank portion 2Oa is provided with an aper-7 v ture .22; lnFigs. 1 and 2, the parallel rigid blade supporting arms 17 are illustrated as 'being provided with equi-.spaced bolts or rivets 23 which are'employed for connecting` the cutting blades, by means of the apertures 21 formed in the shank portions 20, to the V said rigid bars 17 It will beseen by inspecting Fig. 2 that these .cutting blades are arranged "inl two sets, whichfI will describe assets A and B, the -s'et "A being positionedl with their beveled surfaces,y which form the f cutting edges 1 9, extending downwardly and therewith.

the `said'bevel surfaces of the set B extending 3upwardly. v The set of cutting blades A are connected tothe parallel rigid blade supf ortingba'rs 17 bylmeans of every alternate holt or Vrivet I23 and are provided with a spacerwasher '24 between their 'lower faces and ythe lower blade supporting bar 17 'while-"the 'set of cutting *blades B are provided "with similar'spacer washers 24 which are 'I'Jos'itioned' between vtheir upper faces and' thenpper' rigid blade supportingV bar 17.

'forpivotally *connectingI the Vrear ends of vthe offsetV shank portions 2Oa of the cutting blades inthe set Afb means of the rivetsl 7Vwhich' extend throug theseV apertures 27 and through the apertures 22' formed in thesaid V"shankLportion 4of thecutting blades. The 'v `four cutting blades in the setB are 'prowidedwith a blade operating bar v32 which "will be termed the lower bar, for the purpose OfdiStinguiShing the samefrom the upper -bar"l25,'and differs from this upper bar 25 "inthat it ydoes not possess as great a length l and is provided with four: aperturesonlyv for receiving the rivets33 which, bymeans of fthe-apertures 22 formed' in' the odset shank portions'20'* vof the set Vof cutter blades 'v B,

connect the said inner ends of this set of blades to the lower blade operating bar 32.

'It-will Jbefseen, by inspecting Figs.v 1 and #3,'. that this llower blade operatingbar 321 is provided `with4 a horizontally extending Apor- {ltion l"26 havingV vadownwardly extending f age'28 that 1sformed,v at its central lpor- "tion,1with the dependingsangular rackbar 'section 29 whichl is provided with the rack *teeth'f30.

The operating shaft 10, which extends through the axially alined bearing portions 5a and 14", is provided with collars 34 and 35 which revent longitudinal movement of the said s aft in respect to the transversely extending rear and front frame bars 5 and 14. The extreme outer end of this operating shaft-10de.,providedv with a cross bar 36 having handle grips 37 at the opposite ends thereof for permitting .the saidV implement to be-moved over `the surface of the ground and for 'permitting `the said operating shaft 10 to lbe oscillated Within the supporting bearings formed in the bars 5 and 14. The

extreme Inner endA of vthis operating shaft 10 is provided ywithfagearaSS which'is suitably keyed to the said shaftandengages the opposedrack teeth 30 and 30 carried by the upper and lower blade operating kbars f 26 and 26a respectively. It will be "seen -by this connection, that when the operating shaft 1() audits gear 38 are Vrotated firstin one direction, thenv in theopposite direction,

the blade operatingbars 25 and/32 will be caused to reciprocate in opposite directions vin respect `to each other. It further Vwill be seenthat ythis-r'eciprocating movement of the -upper and lower bladeoperating bars inoppositedirections in respect to each other will cause the cutting blades to oscillatefupon the bolts or rivets'23l and therebyfbring each blade Vof Vone -set into cuttingcooperation with the two adjacent blades of the other set alternately.

TheV transversely extending Y lfront frame bar 14 is provided, -ono'p'posite sides ofthe bearing lportion14, with uprightsg4() vthat are rigidly secured to thefslaid 'bar 14 Vand extend rearwardly at an angle therefrom. The upper free ends of theseuprights y4() -are provided .with apertures for receiving the` reduced transversely extending ends V41 of the bridge piece 42.1 This'bridge piece 42 is provided with yacentrally positioned aperture 43 for the purpose of receiving the 'clamping bolt l14fwhich connects the mold board 45 thereto. In Fig. 1, the mold board 45 is shown as v being Vprovided f withV an arcuate edge 46 which is' intended to be positioned in transverse relation to thevarious cutting blades and 'terminates in parallelism "with the rivets 23;and slightly Ato the rear thereof. lThis -lnold 'board is furtherV provided with an upwardly extending portion 45 which is adapted for directing the branches o1' the like cut Vfrom bushes laterally to one side of thefimplement. Itis to be understood thati the edge of the mold board 45 extending in parallelism wi'ththeL upwardly directed portion 45l and at right angles to the edge -46 is bent downwardly in the same manne-1' as the said edge 46 for the purpose of permitting the mold board to be lis pivoted on the'bolt 44 forplacing theup-V 5 "wardly directed portion 45` on the left hand side of the implement so that the severed portions of bushes, or the like will be discharged laterally to the right of the implement instead of to the left of the implement, this being, of course, to the rightl of the operator as he stands at the rear facing forwardly, as will result with the mold board in the position as illustrated in Fig. l. For the purpose of retaining the downwardly curved arcuate edge 46 in engagement with the offset forwardly extending frame bar portions 13 and the auxiliary frame arm 16, the lateral projections 42", of the bridge piece 42 carry the coiled end portions 47 of the substantially U-shaped wire spring 48 which has its extreme ends 49 extended through suitable apertures formed in the uprights 40. By inspecting Fig. l, it will be seen that the central port-ion of this substantially U-shaped wire spring 48 will bear against the under surface of the mold board for forcing upwardly upon the portion of the same positioned above the pivot bolt 44.

It is believed that the manner of construction and operation of this implement will be thoroughly understood from the above de tail description. It might be well to note, however, that the implement may be moved over the ground by the operator until the cutting blades are positioned in cutting relation to the bush or object to be trimmed. The operating shaft 10, by means of the cross bar 36, may be rotated in opposite directions for causing the gear 38 to rotate in a similar manner. The rotation of this gear 38, due to its oonnectionwith the teeth of the rack bar sections 29 and 29, will cause the upper and lower blade operating bars 25 and 32 to reciprocate for causing the different sets of blades A and B to be moved towards each other for severing the same branches of the bushes.

It is to be understood that the form of this invention herewith shown and described is to be taken as the preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim l. In a bush trimmer, a wheel supported frame having a pair of transversely disposed vertically spaced bars at its forward end, shear blades arranged in sets with the blades of one set alternating with the blades of the other, said blades being pivoted between said bars and having offset Shanks extending rearwardly from the bars, a pair of bars each having the shanks of a respective set of blades pivoted thereto, racks on the confronting faces of said bars, a pinion between and meshing with the racks, a shaft journalled in said frameand carrying said pinion, and a handle on the rear end of said shaft.

2. In a bush trimmer, a wheel supported frame having cutters at its forward-end and including a transverse member beneath which said cutters are pivoted, a pair of spaced standards on said frame, a bridge piece journalled in said standards, a mold board carried by said bridge piece and having one edge resting on the transverse member, spring means urging said edge against said member, and means to operate the cutters.

In testimony whereof I affix my signature.

KAZIMER DOMBECK.

Cal 

